Different from traditional surgical operation that can remove the morbid tissue at a time , gamma knife treatment requires a long - term period for gradual metamorphosis and putrescence after the garget tissue has been irradiated . generally the period can be divided into the following three stages 它不像外科手术那样可以马上切除病变组织，需要治疗的部位在接受一次性照射后，有一个蜕变坏死的较长过程，一般可分为三个阶段：
